Kraft scrap paper pulp as a substitute of wood chips in manufacture of particleboards resinated with hybrid pf/pmdi resin

This study analyzed feasibility of manufacture of composite particleboards resinated with a mixture of phenol–formaldehyde resin and 4,4′-methylenediphenyl isocyanate in the weight ratio 70:30. For this purpose 3-layer particleboards were produced with varying shares of Kraft scrap paper pulp in the core. Experimental boards were manufactured applying 0, 10, 15, 25, 50 and 75% substitution of wood chips with Kraft paper pulp. Analyses were conducted to determine physico-mechanical properties of boards, i.e. bending strength, modulus of elasticity, internal bond before and after the boiling test and swelling in thickness after 24 soaking in water. Based on recorded testing results it was stated that moisture resistant composite boards manufactured with a 25% substitution of wood chips with Kraft paper pulp meet the requirements of the EN 312 standard for boards used in humid conditions in terms of their strength and moisture resistance specified in the internal bond after the boiling test

Wood-Based Materials in Building

Wood is a widely used building material [...

Nienormatywna metoda wyznaczania izolacyjności akustycznej materiałów płytowych

Non-normative method for determining acoustic insulation of board materials. The paper presents a new method for the measurement of acoustic insulation against airborne sounds in the insulation and construction board materials used in wooden and brick buildings. The primary aim of the study was to simplify the design of a test stand, and thus of individual measurements, while maintaining the confidence level of the results. A series of measurements was performed to evaluate this method’s suitability for determining the acoustic insulation of board materials, and the resulting sound reduction index was analyzed with reference to the tested material and frequency of the generated sound. The study outcomes were found to be consistent with the principles of building acoustics and allowed for drawing preliminary conclusions on the insulating properties of various board materials and sets of materials used for the construction of building partitions.Nienormatywna metoda wyznaczania izolacyjności akustycznej materiałów płytowych. W pracy zaprezentowano nową, opracowaną przez autorów metodę pomiaru izolacyjności akustycznej od dźwięków powietrznych płytowych materiałów konstrukcyjnych i izolacyjnych stosowanych w budownictwie drewnianym i murowanym. Celem pracy było przede wszystkim uproszczenie stanowiska pomiarowego, a tym samym sposobu przeprowadzania pomiarów jednostkowych, przy zachowaniu poziomu ufności otrzymanych wyników. Dla określenia przydatności prezentowanej metody do wyznaczania izolacyjności akustycznej materiałów płytowych dokonano szeregu pomiarów oraz analizy wyznaczonego na ich postawie wskaźnika izolacyjności akustycznej w zależności od rodzaju badanego materiału i częstotliwości generowanego dźwięku. Stwierdzono, iż uzyskane wyniki badań są zgodne z zasadami akustyki budowli i pozwalają na formułowanie wstępnych wniosków odnośnie izolacyjności poszczególnych materiałów płytowych oraz ich zestawów w konstrukcji przegród

White mustard straw as an alternative raw material in the manufacture of particleboards resinated with different amounts of urea-formaldehyde resin

In this work the optimum resination rate of white mustard straw particles with UF resin in the production of straw particleboards was investigated. The resination rates used in this study were 10, 12 and 14%. For the selected resination rate, the possibility of reducing the density of the straw particleboards was also determined. In order to evaluate the hygienic parameters of the experimental boards, the formaldehyde content and volatile organic compounds (VOC) were determined. Moreover, using a thermogravimetric analysis (TGA) the boards’ disposal options by means of burning or co-incineration were investigated. The study results showed thata 10% resination rate enabled the production of white mustard particleboards of type P1 and P2, while the simultaneous reduction in their density to 600 kg/m3limited their application to dry conditions only, i.e. boards of P1 type. Thermogravimetric analysis revealed a variable thermal performance of the studied boards.The pine particleboards showed a higher thermal resistance, however, up to a temperature of 750°C, the samples of the experimental boards underwent a similar process of thermal destruction

Kraft scrap paper pulp as a substitute of wood chips in manufacture of particleboards resinated with hybrid pf/pmdi resin

This study analyzed feasibility of manufacture of composite particleboards resinated with a mixture of phenol–formaldehyde resin and 4,4′-methylenediphenyl isocyanate in the weight ratio 70:30. For this purpose 3-layer particleboards were produced with varying shares of Kraft scrap paper pulp in the core. Experimental boards were manufactured applying 0, 10, 15, 25, 50 and 75% substitution of wood chips with Kraft paper pulp. Analyses were conducted to determine physico-mechanical properties of boards, i.e. bending strength, modulus of elasticity, internal bond before and after the boiling test and swelling in thickness after 24 soaking in water. Based on recorded testing results it was stated that moisture resistant composite boards manufactured with a 25% substitution of wood chips with Kraft paper pulp meet the requirements of the EN 312 standard for boards used in humid conditions in terms of their strength and moisture resistance specified in the internal bond after the boiling test

Possibility of using the expanded polystyrene and rape straw to the manufacture of lightweight particleboards

The study investigated the possibility of using rape straw and expanded polystyrene for the production of low density particleboards. Particleboards with the core layer made of wood chips or rape straw, partly substituted with polystyrene (7%), were manufactured within the density range of 500 – 650 kg/ m3, and resinated with MUF resin. Our study confirmed that wood chip-expanded polystyrene (WP) and wood chip-rape straw-expanded polystyrene boards (WRP), of density reduced to 600 kg/m3, metthe mechanical requirements of the subject standard for boards intended for interior design (including furniture) and used in dry conditions. However, further density reduction required an increased resinationof the core layer